Page 33 - Start Up Mathematics_6

Exemplar Problems

1. Which of the following numbers in Roman numerals is incorrect?
(a) LXII (b) XCI (c) LC (d) XLIV
2. In Roman numeration, if a symbol is repeated, its value is multiplied as many times as it
occurs. (True/False)
3. Estimated sum of 7,826 and 12,469 rounded off to hundreds is 20,000. (True/False)

4. The number five crore twenty three lakh seventy eight thousand four hundred one can be
written, using commas, in the Indian system of numeration as ______________.
5. Estimate the product 5981 × 4428 by rounding off each number to the nearest:
(a) tens (b) hundreds
6. The diameter of Jupiter is 142800000 metres. Insert commas suitably and write the diameter
according to International system of numeration.
7. A mobile number consists of ten digits. First four digits are 9, 9, 7 and 9. Make the smallest
mobile number by using only one digit twice from 8, 3, 5, 6, 0.
8. Chinmay had ` 610000. He gave ` 87500 to Jyoti, ` 126380 to Javed and ` 350000 to John.
How much money was left with him?

9. A factory has a container filled with 35874 litres of cold drink. How many bottles of 200 ml
capacity each can be filled.

GROUP ACTIVITY
Forming 5-Digit Numbers

Objective: To learn about place value of digits
Material required: Flash cards numbered 0 to 9
Directions: Try to build the greatest number
• Divide the class into groups. Give flash cards with digits from 0 to 9 to each group.
• Fold ten slips with digits 0 to 9 written on them and put in a box.
• Pick a slip and read the digit.

• Student from each group holding the flash card of the digit called out will take position of
their choice marked U (unit), T (ten), H (hundred), Th (thousand), TTh (ten thousand) on
the floor designated for their group.

8 4 0

TTh Th H T U

• The procedure is repeated till all the five slots are occupied by the students. The positions
once taken cannot be changed or interchanged with others.
Result
• The group with the greatest number formed wins the game and the one with the second
highest number comes second. The group with next number in descending order is third
and so on. The group with the smallest number comes last.

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